Brush-holder for dynamo-electric machines



(No Model.) V

E. R." KNOWLES.

BRUSH HOLbER FOR DYNAMO ELEOTRIG MACHINES. No. 508,624. Patented Nov. 14,1893.

UNITED STATES PATENT Orntcn.

EDWARD R. KNOWLES, OF IWIIDDLETOWN, CONNECTICUT, ASSIGNOR TO THE SCHUYLER ELECTRIC COMPANY, OF CONNECTICUT.

BRUSH-HOLDER FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 508,624, dated November 14, 1893.

Application filed March 20, 1893. Serial No. 466,759. (No model.)

To all whom it may concern:

Be it known that I, EDWARD R. KNOWLES, a citizen of the United States, residing at Middletown, in the county of Middlesex and State of Connecticut, have invented certain new and useful Improvements in Brush-Holders for Dynamo-Electric Machines,'of which the following is a specification.

My invention relates to machines for transforming electric energy into motion and power, or vice versa, and it has especial referonce to small electric motors.

The object of the invention is, to facilitate the insertion, removal and adjustment of the current collecting or distributing brushes, and the invention consists in an adjustable sliding and rotating follower adapted to rest against the outer end of the (preferably) carbon brush, as hereinafter more fully set forth.

In the drawings,-Figure 1 is an end elevation of an electric motor, provided with my improved brush-holders. Fig. 2 is a top plan view of a portion of the machine and a single holder. Fig. 3 shows the follower reversed, to permit the brush to be removed and Fig. 4 is an end view of the adjusting nut.

The motor shown is one adapted for communicating to two or more shafts motion in one direction or the other, the shafts being driven either one at a time or simultaneously, as desired. It is especially useful in manipulating search lights from a distant controlling stand.

The construction of the motor forms no part of this invention, and hence, need not be described, further than to say that the gears 1, 2, are rotated continuously by the pinion 3 on the shaft of the large spur-gear 4, which is in mesh with the pinion 5 on the armature shaft of the motor. Adjacent to each gear 1, 2, is a pair of ring contacts A, B, rotating with the gear and in circuit with the electro-magnet of an electro-magnetic clutch, which operates to lock the normally loose gear to its shaft. The electric current to energize the electro-magnet is conveyed to the ring contacts through the stationary brushes C, 0, one in contact with each ring. It is the construction of these brushes which forms the subject of my invention. Though I have shown and described them as conveying current to an electro-magnetic clutch, yet it is evident that they are applicable to any of the purposes for which such brushes are put, 1n machinery of this class.

Insulated from the frame of the machine in any suitable manner, is the block D, containing a slot to hold the brush, which is preferably of carbon. The block D has a bind ng post d, or other suitable means for attaching an electric conductor E. Projecting from the block in a line parallel with the axes of the brush isa round rod d, the outer end of which is screw-threaded. A follower F slides on the rod, having a shoulder f projecting over 1nto line with the slot in the block D, and resting against the end of the brush, where it is held by a helical spring G encircling the rod (1 and abutting against a nut I-[ screwed upon the end of the rod. The nut is preferably split, and provided with a tangent screw ,h, to clamp it firmly upon the rod d when it has been adjusted to give the spring the proper tension. When the brush is to. be removed, the follower is drawn away from it and turned half way around in the reversed position in which it appears in Fig. 3. The brush can then be slid out, as shown in dotted lines.

Having thus described my invention, what I claim is- 1. A brush holder comprising a follower sliding parallel with the brush and rotatable about its axis of motion, substantially as described.

2. A brush holder comprising a follower having on one side a shoulder to rest against the brush, and rotatable about an axis parallel with but at one side of said brush, substantially as described.

3. A brush-holder comprising a block having a slot to receive the brush, a rod parallel with said slot, and a follower sliding and rotatable on said rod, substantially as described.

4. A brush-holder comprising a block having a slot to receive the brush, a rod parallel with said slot, and a follower sliding and retatable on said rod and having a shoulder projecting into line with the slot, to rest against the brush, substantially as described.

5. A brush holder comprising a slotted block, a screw-threaded rod projecting therefrom, a follower sliding and rotatable 'on the rod, a nut, and aspring' confined between the nut and the follower, substantially as described.

6. In a brush-holder, the combination with a screw-threaded rod, of a follower sliding and rotatable thereon, a spring bearing against the follower, and a split nut on the rod, having a screw for clamping it thereon, substantially as described.

7. A brush-holder, comprising the slotted block D, having the rod (1', the follower F,

sliding and rotatable on the rod and having a shoulder-f, the spring G, and the split nnt H having the clamping screw h, substantially as described.

Signed at MQiddletown, in the county of Middlesex and State of Connecticut, this 15th day of l ebruary, A. D. 1893.

EDXVARD R. KNOWLES.

Witnesses:

GEO. McKAY, J. A. KENISTON. 

